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I have a 1997 SL600 that cranks, but doesn't run. If I fuel…

Customer Question

I have a 1997...

I have a 1997 SL600 that cranks, but doesn't run. If I squirt fuel ipast the throttle bodies, the car starts and run for about 10 seconds. I suspect that DAS is interfering with the start function. I replaced the transponder ring to no avail.

Mechanic's Assistant: Have you checked the fuel supply? And are all the spark plugs working?

Oh yes. There is plenty of fuel and fuel pressure in the fuel rail.

Mechanic's Assistant: Are you fixing your SL600 yourself? What have you tried so far?

Just the overall diagnostics that the engine has fuel and spark, but the injectors aren't firing, so I figured DAS.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

WORK TIME, I am here 7 days a week but not all hours of the day, do not worry I will respond.

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I do need the vin # to get the factory information to assist.

Did you have a scan test of all modules?

did you inspect the engine wiring harness for breaks and chaffs?

Thanks

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Customer reply replied 8 months ago

WDBFA76F1VF147331The car is at an independent MB mechanic that I have frequented in the past. This issue arose after I pulled the dash to change out a leaky evaporator. The car ran perfectly after replacing the evaporator last Saturday and then wouldn't start on Sunday. I only send the car out for service for things that I can't do myself like recharging the AC system. They have the MB scanning software to interface with the car's various systems (not just the OBDII port, which I have for check engine light stuff, but MB Star). The techs are looking for communication issues between the DAS module and the EMC, but haven't reported anything yet. The 1997 model year isn't one of the troublesome years for the biodegradable wiring, but to answer your question; I didn't notice any degraded wires or wire bundles. Everything still looks factory fresh and intact.

here what is puzzling is that it would run 10 seconds and then stall. if you keep spraying fuel in the throttle body does it keep running?

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Customer reply replied 8 months ago

it would keep running. I believe the DAS (Drive Authorization Service) isn't authorizing the EMU to run the car by preventing the injectors from firing. I have run a meter to one of the injector connections and it does get power, but it never sees the intermittent ground flutter that would causes it to fire.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.